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<!DOCTYPE html> <html> <head></head> <body> <h3>Javascript Remove Underscore from String and Capitalize</h3> <input type="text" id="input" value="font_awesome_icons" /> <p id="output"></p> <button onclick="processInput()">Process</button> <script> function replaceUnderscoresAndCapitalize(str) { str = str.replace(/_/g, " "); str = str.replace(/\b\w/g, function (match) { return match.toUpperCase(); }); return str; } function processInput() { var input = document.getElementById("input").value; var output = replaceUnderscoresAndCapitalize(input); document.getElementById("output").textContent = output; } </script> </body> </html>